TTI vs Dougs

famous bob said
Do any of you ever see a hi dollar professional race car that " isn`t " coated, I haven`t seen one in years ! I don't think they`re worried about flaking and getting back into the engine thru reversion !!

We're not worried about flaking getting back into the cylinder, but the ID reduction restricting the flow....

If the ID of the pipes gets smaller, the flow restriction is increased...

Thermal coatings should be on the outside of the pipes, not the inside.... That way it doesn't make the ID smaller...